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Tire/wheel assembly

a technology for wheels and tires, applied in the field of tires/wheel assemblies, can solve the problems that the run-flat support body cannot be inserted into the inside of the pneumatic tire, and the mounting becomes impossible, and achieve the effect of enhancing the durability of the run-flat support body and reducing the rigidity of the bead cores

Inactive Publication Date: 2005-10-06
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] An object of the present invention is to provide a tire / wheel assembly an outside diameter of a run-flat support body of which can be increased without reducing the mounting performance, and whose run-flat durability is further enhanced.
[0009] However, in the present invention, the cross sectional area of the bead cores is reduced to a range from 25 to 40 mm2. Accordingly, the rigidity of the bead cores is reduced and an inside circumferential shape of the bead part can be transformed easily. Therefore, even when the outside diameter is enlarged by setting the height A of the run-flat support body in the cross section thereof at 50 to 60% of the height SH of the tire in the cross section thereof, it is possible to insert the run-flat support body easily into the inside of the pneumatic tire. Moreover, by enlarging the outside diameter of the run-flat support body, it is possible to further enhance the run-flat durability of the run-flat support body.

Problems solved by technology

However, when the outside diameter of the run-flat support body is made greater by a certain degree than the inner diameter of the bead part of the tire, the run-flat support body cannot be inserted into the inside of the pneumatic tire and the mounting becomes impossible.

Method used

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Examples

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examples

[0032] With 205 / 55R16 and 16×6 1 / 2JJ applied respectively as common tire size and rim size, seven types of tire / wheel assemblies (which are a conventional example, comparative examples 1 and 2, and embodiments 1 to 4) having various ratios of the height A of the run-flat support body in the cross section thereof relative to the height SH of the tire in the cross section thereof and various cross sectional areas of the bead core were manufactured.

[0033] Regarding these seven types of tire / wheel assemblies, ease of performing an inserting operation of the run-flat support body into the inside of the pneumatic tire (insertion operability), and the run-flat durability of the run-flat support body have been measured in accordance to the measurement method described below. Results are shown in Table 1.

[Run-Flat Durability]

[0034] Each tire / wheel assembly for testing was fitted to the left front side of a passenger car of 2500 cc displacement with a tire pressure set at 0. Meanwhile, the...

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PUM

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Abstract

A tire / wheel assembly, wherein a run-flat support body (3), comprising an annular shell (4) having an outer peripheral side as a support surface and an inner peripheral side formed in fork-shaped open legs and elastic rings (5) supporting the ends of the legs on a rim, is inserted into a hollow part of a pneumatic tire (2), and wherein the height (A) of the run-flat support body (3) in the cross section thereof is 50 to 60% of the height (SH) of the pneumatic tire (2) in the cross section thereof, and wherein the cross sectional area of the bead cores (7) of the pneumatic tire (2) is 25 to 40 mm2.

Description

TECHNICAL FIELD [0001] The present invention relates to a tire / wheel assembly, more specifically, to a tire / wheel assembly offering enhanced run-flat durability without reducing mounting performance. BACKGROUND ART [0002] Numerous-techniques for achieving emergency running for several hundred kilometers when a pneumatic tire blows out while driving a vehicle have been proposed to meet demands from the market. Among these numerous proposals, techniques, disclosed in Japanese Unexamined Patent Publication No. 10(1998)-297226 and in Japanese Translation of PCT International Application No. 2001-519279, achieve driving in a run-flat state by means of fitting a core onto a rim inside a hollow part of a pneumatic tire mounted on the rim, and by means of supporting the flat tire by the core. [0003] The run-flat core (support body) has a configuration including an annular shell having an outer peripheral side as a support surface and having an inner peripheral side formed in fork-shaped ope...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60C15/04B60C17/04B60C17/06
CPCB60C15/04B60C17/043B60C17/06B60C17/04B60C17/00
Inventor SHIMURA, KAZUHIROSEKIGUCHI, TAKUMINAITO, MITSURU
Owner YOKOHAMA RUBBER CO LTD
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